Alright, let's work through 2686 times 7723 step by step
2686 × 7723 = 7723 × (2686)
+ 7723 × 6 yielding 46338
+ 7723 × 80 giving us 617840
+ 7723 × 600 which equals 4633800
+ 7723 × 2000 that results in 15446000

= 20743978
